# CVE-2026-100313: mathurvishal CloudClassroom-PHP-Project updatequery.php cross site scripting

> Remote attackers can inject malicious scripts via the queryx parameter in updatequery.php, potentially compromising user sessions.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 26 Sep 2026
- **Updated:** 28 Sep 2026
- **Also known as:** GHSA-9f8m-gw4v-5223

## What is CVE-2026-100313?

CVE-2026-100313 is a medium-severity cross-site scripting vulnerability in mathurvishal CloudClassroom-PHP-Project, published on 26 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A weakness has been identified in mathurvishal CloudClassroom-PHP-Project up to 5dadec098bfbbf3300d60c3494db3fb95b66e7be. This affects an unknown function of the file updatequery.php. Executing a manipulation of the argument queryx can lead to cross site scripting. It is possible to launch the attack remotely. The exploit has been made available to the public and could be used for attacks. This product takes the approach of rolling releases to provide continious delivery. Therefore, version details for affected and updated releases are not available. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-100313?


## How do I fix CVE-2026-100313?

No fix has been published for CVE-2026-100313 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-100313 being exploited?

There is no known exploitation of CVE-2026-100313 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-100313 and fix it if it is affected.

What it is: CVE-2026-100313 is a medium-severity cross-site scripting vulnerability in mathurvishal CloudClassroom-PHP-Project, published on 26 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-100313 in the wild and no public exploit code.

Affected product: mathurvishal CloudClassroom-PHP-Project. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-100313/ (Markdown: https://insights.sbomify.com/CVE-2026-100313/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-100313
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-100313
- OSV: https://osv.dev/vulnerability/CVE-2026-100313

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-100313/
Summaries are generated and may contain mistakes; the official description above is the record.